A New Lanternshark Etmopterus splendidus from the East China Sea and Java Sea. (Received July 30, 1986)

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1 Japanese Journal of Ichthyology Vol.34, No A New Lanternshark Etmopterus splendidus from the East China Sea and Java Sea Kazunari Yano (Received July 30, 1986) Abstract A new species of the lanternshark Etmopterus splendidus is described. This new species is distinguished from the congeners by the combination of the following characters: distance from snout tip to 1st dorsal spine much less than distance from the spine to upper caudal origin; caudal fin short, much less than head length; dermal on lateral side of trunk with very small, erect thornlike, conical crowns, those on trunk arranged in regular longitudinal rows, and distinctly arranged on interdorsal area and on lateral trunk of interspace between 2nd dorsal and caudal, but not arranged in regular longitudinal rows on dorsal surface of interorbital and on abdomen; color in life purplish-black above and with inconspicuous bluish-black flank marks and three other bluish-black marks at base of caudal fin and along its axis; shape of flank marks narrow anterior to, but broader posterior to pelvic fins. The genus Etmopterus is characterized within the family Squalidae as having a strong spine extending along the anterior margin of each dorsal fin, unicuspid teeth with recumbent cusp in the lower jaw, and multicuspid teeth in the upper jaw. The species of Etmopterus are divided into three main groups by the shape of the dermal : (1) with low, flat, concave sessile crowns; (2) with erect thornlike, cuspidate crowns and arranged in regular longitudinal rows; and (3) with erect thornlike, cuspidate crowns and not arranged in regular longitudinal rows. Group (1) includes E. pusillus from the Atlantic and E. frontimaculatus from the Pacific. Nakaya (1982) reported a species from Kyushu Palau Ridge with similar to those of Etmopterus pusillus but with longer snout. Krefft (1968) stated that E. frontimaculatus should be placed in the synonymy of E. pusillus, but Dolganov (1986) claimed that E. frontimaculatus was a valid species. Group (2) was reviewed by Yamakawa et al. (1986) and they reported 6 species. Dolganov (1986) reported a new species E. schmidti from Sagami Bay in Japan. Group (3) includes at least 13 valid species. Cornpagno (1984) reviewed this group of Etmopterus and reported 11 species. Springer and Burgess (1985) added to this group two new species from the Caribbean coast of Colombia. Methods Measurements followed Yano and Tanaka (1983). Vertebral counts were made according to the method of Springer and Garrick (1964). Dermal were studied under a binocular microscope and photographed with a scanning electron microscope. Soft X-ray were used to make radiographs of the vertebrae. Institutional abbreviations are shown below: AMNH, American Museum of Natural History; BMNH, British Museum (Natural History); FUMT, University Museum, University of Tokyo; MCZ, Museum of Comparative Zoology, Harvard University; NSMT, National Science Museum, Tokyo; TMFE, Department of Fisheries, Faculty of Marine Science and Technology, Tokai University; USNM, United States National Museum of Natural History, Smithsonian Institution; VIMS, Virginia Institution of Marine Science. Comparative materials Group (1): Etmopterus pusillus, BMNH , syntype, female, 315mm total length (TL), 255 mm body length from snout tip to upper caudal origin (BL), male, 208mm TL, 159mm BL, Madeira. Group (2): E. abernethyi, MCZ 39714, paratype, female, 274mm TL, 210mm BL, 7 miles south of Kaikoura (New Zealand), 150m depth, Feb., 1956, (=E. molleri); E. brachyurus, USNM 70257, holotype, male,? TL, 189mm BL, off Jolo Island (Philippines); E. bullisi, USNM , holotype, female, 192mm \ 421 \

2 Japan. J. Ichthyol. 34 (4), 1988 B Fig. 1. Holotype of Etmopterus splendidus sp. nov., NSMT-P 50273, female, 247mm TL. A, lateral view; B, ventral view of head region. TL, 144mm BL, 30 02'N, 80 05'W (Northeast coast of Florida), 1 May, 1956; E. granulosus, BMNH : 460, holotype, male, 255mm TL, 192mm BL, Chile; E. lucifer, TMFE 599, female, 312mm TL, 244 mm BL, off Ukusu in Suruga Bay, 200m depth, 27 Sep., 1981; E. molleri, female, 398mm TL, 318mm BL, 'N, 'E (off Hateruma Island, Okinawa), 615m depth, 18 Dec., 1984; E. polli, MCZ 38001, holotype, male, 187mm TL, 147mm BL, 6 08'S, 11 24'E (off northern Angola), m depth; E. villosus, USNM 51583, holotype, male, 164mm TL, 128mm BL, Molokai Island (Hawaii), m depth, 1 Apr., Group (3): E. baxteri, male, 375mm TL, 287mm BL, 44 39'S, 'E (New Zealand), m depth, 8 Mar., 1983; E. carteri, USNM , holotype, female, 190mm TL, 144mm BL, 11 09'N, 74 26' W (off Barranquilla, Colombia), m depth, 19 May, 1964; E. decacuspidatus, BMNH : 7, holotype, male, 284mm TL, 221mm BL, 'N, 'E (120 miles of Cape Bastion, Hainan) m depth, 5 Mar., 1965; E. gracilispinis, AMNH 35390, female, 128mm TL, 98mm BL, 35 56'N, 74 48'W (off Roanoke Island), 2 Nov., 1975; E. hillianus, MCZ 1025, holotype, female, 219mm TL, 182mm BL, Cuba; E. perryi, USNM , holotype, female, 178mm TL, 135mm BL, 11 09'N, 74 25'W (off Barranquilla, Colombia), 292m depth, 19 May, 1964; E. princeps, VIMS 06678, male, 459mm TL, 344mm BL, 'N, 'W (Middle Atlantic Bight), m depth, 9 May, 1980; E. schultzi, USNM , holotype, male, 255mm TL, 191mm BL, 29 11'N, 86 52'W (Gulf of Mexico), 457m depth, 24 Feb., 1951; E. spinax, AMNH 49503, male, 214mm TL, 161mm BL, 'N, 'W (Bill Baiky), m depth, 26 Sep., 1981; E. unicolor, TMFE 1882, male, 520mm TL, 415mm BL, off Okitsu in Suruga Bay, 1200m depth, 14 May, 1983; E. virens, USNM , holotype, male, 185mm TL, 137mm BL, 27 51'N, 91 32'W (Gulf of Mexico), 330m depth, 11 Nov., Etmopterus splendidus sp. nov. (New Japanese name: Futoshimi-fujikujira) (Fig. 1) Holotype. NSMT-P 50273, immature female, 247 mm TL, 194mm BL, 79.0g in body weight, 'N, 'E (off Shimo-Koshiki Island, Japan), 210m depth, line fishing (R/V Tansei Maru), 26 April, Paratypes. FUMT-P 10245, female, 298mm TL, 241mm BL, off Nagasaki, Japan, December, BMNH : 86-88, female, 178mm TL, 143 mm BL, female, 203mm TL, 160mm BL, mature male, 227mm TL, 179mm BL, 8 43'S, 'E (off Java Island, Indonesia), m depth, trawl net (R/V Jurong), August, Diagnosis. Distance from snout tip to 1st dorsal spine much less than distance from the spine to upper caudal origin. Caudal fin short, less than head length. Dermal on lateral trunk with very small, erect thornlike, conical crowns. Denticles on trunk arranged in regular longitudinal rows, and distinctly arranged on interdorsal area and on lateral trunk of interspace between 2nd dorsal and caudal, but not arranged in regular longitudinal rows on dorsal surface of interorbital, on abdomen, on bluish-black flank marks above pelvic fins, and on marks of caudal fin base and axis. Color in life purplish-black above, with inconspicuous bluish-black flank marks and three other bluish-black marks at base \ 422 \

3 Yano: Fig. 2. Dermal 1st dorsal fin; B, of New Etmopterus Lanternshark from splendidus of abdomen sp. between of caudal fin and along its axis, shape of flank marks narrow anterior to, but broader posterior to pelvic fins. Description. In the following, holotype values are followed by paratype values in parentheses. Trunk subcylindrical, head somewhat flattened, head measured to 5th gill opening 3.34 ( ) in BL. Height of trunk at origin of pectoral 6.45 ( ) in BL. Snout short and rounded, its length 1.20 ( ) in horizontal diameter of eye and 1.68 ( ) in interorbital width. Length from snout tip to mouth 0.81 ( ) in posterior margin of eye to 1st gill opening. Eye moderately large, horizontal diameter of eye 3.87 ( ) in head. Spiracle semicircular, greatest diameter of spiracle 3.75 ( ) in horizontal diameter of eye. Prespiracular head length 0.84 ( ) in length from anterior margin of spiracle to pectoral origin. Gill openings small and vertical. Nostrils moderately large, slightly oblique, nasal flaps poorly developed. Interspace between nostrils 3.06 ( ) in preoral length. Mouth slightly arched, its width 1.16 ( ) in preoral length. Length from snout tip to 1st dorsal spine 1.32 ( ) in length from 1st dorsal spine to origin of upper caudal fin. Length base of 1st dorsal fin 1.54 ( ) in that of 2nd dorsal fin. Height of 1st dorsal fin 1.59 ( ) in that of 2nd dorsal fin. Length of 1st dorsal spine 2.13 (2.00- nov., pectoral Southeastern NSMT-P fins. Asia Each A, scale bar indicates of trunk 500ƒÊm below. 2.33) in height of 1st dorsal fin. Second dorsal spine large, its length 1.17 ( ) in height of 2nd dorsal fin. Interdorsal space 1.15 ( ) in length from snout tip to pectoral origin. Rear end of 1st dorsal base nearer to rear margin of folded pectoral fin than to pelvic origin, length from rear margin of pectoral to rear end of 1st dorsal base 7.30 ( ) in length from rear margin of pectoral to pelvic origin. Length of pectoral base 1.96 ( ) in length of anterior margin of pectoral. Interspace between pelvic and caudal 1.46 ( ) in that between pectoral and pelvic. Caudal fin short, less than head length. Caudal fin with well-marked subterminal notch. Length of lower caudal lobe 1.96 ( ) in that of upper lobe. Teeth, 17-17/18-18 ( / ), dissimilar in upper and lower jaws. Upper with five cusps in female specimens but seven cusps in male specimen, lower unicuspid shaped. Three series of teeth functional in upper, one series in lower. Dermal on lateral trunk with very small, erect thornlike, conical crowns (Fig. 2). Denticles on lateral trunk arranged in regular longtudinal rows, and distinctly arranged on dorsal surface of interdorsal area and on lateral trunk of interspace between 2nd dorsal and caudal, but not arranged in regular longitudinal rows on dorsal surface of interorbital, on abdomen, on \ 423 \

4 Japan. J. Ichthyol. 34 (4), 1988 bluish-balck flank marks above pelvic fins, and on marks of caudal fin base and along its axis; 2nd dorsal base of holotype and BMNH paratypes with, but that of FUMT paratype without. Distal margins of fins largely covered with skin, not fringed with naked ceratotrichia. Color in life purplish-black above, and underside of snout and abdomen grading to bluishblack with inconspicuous bluish-black flank marks running ahead and behind pelvics and three other bluish-black marks at caudal fin base and along its axis, but color of holotype specimen freshly preseved in 10% formalin and BMNH paratypes preserved in 70% alcohol brownish-black above and underside of snout and abdomen grading to bluish-black, with inconspicuous bluish-black flank marks and three other marks; color of FUMT paratype preserved in 70% alcohol brown above underside of snout and abdomen grading to brownish-black with conspicuous brownish-black flank marks and three other brownish-black marks at caudal fin base along its axis; shape of flank marks narrow anterior to pelvics but broader posteriorly and not pointed; color of margins of pectorals, pelvics and dorsals white. Total vertebral number 80 (78-82), monospondylous 39 (37-39), and precaudal 57 (56-58). Number of turns in spiral valves 10. Proportional dimensions are given here as percentages of total length for the holotype followed parenthetically by the paratypes. Snout tip to: outer nostril, 1.8 ( ); eye, 5.1 ( ); spiracle, 13.0 ( ); mouth, 10.5 ( ); 1st gill opening, 19.0 ( ); 3rd gill opening, 21.5 ( ); 5th gill opening, 23.5 ( ); pectoral origin, 23.7 ( ); rear margin of pectoral when laid back, 35.2 ( ); pelvic origin, 51.8 ( ); cloaca, 57.1 ( ); 1st dorsal origin, 32.8 ( ); 1st dorsal spine origin, 33.4 ( ); 2nd dorsal origin, 57.9 ( ); 2nd dorsal spine origin, 59.7 ( ); upper caudal origin, 78.3 ( ); lower caudal origin, 76.5 ( ). Eye: horizontal diameter, 6.1 ( ); interorbital width, 8.5 ( ). Spiracle: greatest diameter, 1.6 ( ). Gill opening length: 1st, 1.6 ( ); 3rd, 1.6 ( ); 5th, 1.6 ( ). First dorsal fin: overall length, 9.7 ( ); length base, 5.3 ( ); length base from exposed spine, 3.6 ( ); height, 3.4 ( ); length spine, exposed portion, 1.6 ( ). Second dorsal fin: overall length, 14.2 ( ); length base, 8.1 ( ); length base from exposed spine, 6.1 ( ); height, 5.5 ( ); length spine, exposed portion, 4.7 ( ). Pectoral fin: length anterior margin, 10.7 ( ); length base, 5.5 ( ). Pelvic fin: overall length, 12.6 ( ); length base, 8.5 ( ). Caudal fin: length upper lobe, 20.7 ( ); length lower lobe, 10.5 ( ). Trunk at pectoral origin: width, 13.4 ( ); height, 12.2 ( ). Distance between bases: 1st and 2nd dorsal, 20.7 ( ); 1st and 2nd dorsal spine, 22.3 ( ); 2nd dorsal and upper caudal, 13.2 ( ); pectoral and pelvic, 24.3 ( ); pelvic and lower caudal, 16.6 ( ). Biological notes. The holotype was caught with night line fishing at depth of 210m off Shimo- Koshiki Island, East China Sea, Japan. The bait used was squid. BMNH paratypes were caught with night trawl nets at depths between m off Java Island, Indonesia. The holotype specimen is an immature female. The ovaries weighed 0.19g and contained about 30 ova measuring 2-3mm in diameter, and the threadlike uteri measured 2mm in diameter. The paratype male (227mm TL) was considered to be mature since it had hard claspers with spurs. The stomach of the holotype was empty but the intestine included squid beaks and lenses. Remarks. The new species is included in Group (2) whose are erect thornlike, cuspidate crowns and arranged in regular longitudinal rows. E. splendidus differs from the other species of Group (2) in the following characters: from E. lucifer, E. brachyurus and E. molleri in lacking long and narrow flank marks before and behind pelvic fins; from E. granulosus in having flank marks extending to front of pelvic origin, shape of the marks behind pelvics broad, three marks at caudal fin base and along its axis (two marks in E. granulosus) interspace between pectorals and pelvics about equal to head length and rear margin of pectoral fin when laid back, over 1st dorsal spine; from E. bullisi in having a short caudal fin, less than head length and lacking long and narrow flank marks running before and behind pelvic fins; from E. villosus in having distance from \ 424 \

5 Yano: New Lanternshark from Southeastern Asia snout tip to first dorsal spine much less than distance from spine to upper caudal origin. Compagno (1984) included E. polli in Group (3). But I observed that the of the holotype of E. polli are mostly arranged in regular longitudinal rows. But E. splendidus differ from E. polli in having interspace between pectorals and pelvics longer than interspace between pelvics and lower caudal origin. Dolganov (1986) reported a new species, E. schmidti, which has long and narrow flank marks at ahead and behind pelvic fins. I think that E. schmidti is a synonym of E. brachyurus or E. molleri judged by the illustration of Dolganov (1986). Acknowledgments I wish to express my sincere thanks to Dr. K. Mizue and Dr. A. Takemura, Faculty of Fisheries, Nagasaki University; Dr. T. Otake and Ms. M. Ooya, Ocean Research Institute, University of Tokyo; and Dr. S. Tanaka, Faculty of Marine Science and Technology, Tokai University for their valuable assistance during the cruise of investigation in the East China Sea. Dr. T. Taniuchi informed me that specimens of this new species were deposited in his laboratory and in the British Museum (Natural History). I am also indebted to Dr. Taniuchi and Mr. H. Tachikawa, Faculty of Agriculture, University of Tokyo and Dr. P.J. Whitehead, British Museum (Natural History) for generously allowing me to examine the paratypes; to Dr. G. Nelson, Dr. G. Dingerkus and Ms. M.N. Feinberg (AMNH), Mr. A. Wheeler, Dr. K. Banister and Ms. M. Holloway (BMNH), Dr. K. Mochizuki (FUMT), Mr. K. Hartel and Dr. K.F. Liem (MCZ), Dr. K. Matsuura (NSMT), Dr. V.G. Springer, Dr. R. Gibbs and Ms. S. Jewett (USNM), Dr. J. Musick (VIMS) for their cooperation during the examination of the specimens; to Mr. Y. Fukuda, Department of Anatomy, Faculty of Medicine, University of Tokyo for taking photographs of the ; to Ms. M. Holloway for taking soft X-ray radiographs of BMNH specimens; and to Ms. B. Davis, Natal Sharks Board for improving the English. 1-Hexanchiformes to Lamniformes. FAO Fisheries Synopsis, 4 (125): i-viii Dolganov, V.N Description of new species of sharks of the family Squalidae (Squaliformes) from the north-western part of the Pacific Ocean with remarks of validity of Etmopterus frontimaculatus. Zool. Z., 65 (1): (In Russian.) Krefft, G Neue und erstmalig nachgewiesene Knorpelfische aus dem Archibenthal des Sildwestatlantiks, einschlielllich einer Diskussion einiger Etmopterus-Arten sudlicher Meere. Arch. Fischereiwiss., 19 (1): Nakaya, K Etmopterus sp. Page 53 in O. Okamura, K. Amaoka and F. Mitani, eds. Fishes of the Kyushu-Palau Ridge and Tosa Bay. Japan Fisheries Research Conservation Assoc., Tokyo. Springer, S. and G.H. Burgess Two new dwarf dogsharks (Etmopterus, Squalidae), found off the Caribbean coast of Colombia. Copeia, 1985 (3): Springer, V.G. and J.A.F. Garrick A survey of vertebral numbers in sharks. Proc. U.S. Natn. Mus., 116: Yamakawa, T., T. Taniuchi and Y. Nose Review of the Etmopterus lucifer group (Squalidae) in Japan. Pages in T. Uyeno, R. Arai, T. Taniuchi and K. Matsuura, eds. Indo-Pacific fish biology. Ichthyological Soc. of Japan, Tokyo. Yano, K. and S. Tanaka Portuguese shark, Centroscymnus coelolepis from Japan, with notes on C. owstoni. Japan. J. Ichthyol., 30 (3): (Japan Marine Fishery Resource Research Center, 3-27, Kioi-cho, Chiyoda-ku, Tokyo 102, Japan) Literature cited Compagno, L.J.V Sharks of the world. Part \ 425 \

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